Question

A crane lifts a 52kg block 29m in 94s while using 240W.
What is the efficiency of the crane?

Answer 1

65.57 % efficiency

Answer 2

thanks
can you help me work the problem?

Answer 3

i know eff=work out/energy in but im getting lost in working the formulas to get there

Answer 4

How long does is take a 25% efficient 3400W crane to lift a 720kg block 44m?

Answer 5

is this your problem

Answer 6

ya

Answer 7

37 sec

Answer 8

sure? what formula did you use?

Answer 9

effi=(out/in)
he5fi=25%=0.25
in* effi=850W=out
then out=(force*distance)/time

Answer 10

works for first problem but not the second

Answer 11

looking fr t

Answer 12

what are the option

Answer 13

746w = 1 hp